PackBuild is also known as PakBuild and it is an application that is used to unpack files, specifically found in Civilization 4. Civilization 4 is a computer game wherein players are supposed to build an empire and try to expand it while trying to accomplish goals. This game also contains graphics and music as well as animations wherein in order to extract these files, users may need the PakBuild software. PakBuild functions as Civilization 4 unpacker and it allows users to unpack files, specifically Art0.FPK files that are usually located in the assets folder of Civilization 4. PakBuild cannot be compared to typical file extractors and compressors, because this deals mainly with large archives usually found in games. This software is used to unpack or extract archived game files so that users can send the game to a destination on their system. The PakBuild software is 200 kb in size developed by Firaxis and can run on Windows XP and Win2k.